Viewmodels are not visible

Set the following:

viewmodel_fov 54
r_drawviemodel 1

Instead of 54 for viewmodel_fov, you can use any value you prefer.

TF2 crashes when entering a Competitive Matchmaking match

This is due to the config reset feature of in-game competitive matchmaking.
Make sure you are using DirectX 9 (dxlevel 90 or above). Competitive Matchmaking does not work on DirectX 8 (Official FAQ).

Run mm_override in console on the main menu before you join a in-game competitive match to make the config compatible with competitive matchmaking.

You will have to exit the game to reset the lock that competitive puts on the game’s settings.

TF2 exits on startup

This is due a bug from a recent update that causes mat_antialias to crash the game when run on startup. Remove mat_antialias from your custom configs if you have it, remove -dxlevel from your launch options and remove any line with mat_antialias in your tf/cfg/config.cfg file.

Also make sure you don’t have any infinite loops caused by an exec autoexec in your custom configs.

Animation and/or model mods not working

If you are trying to use this sort of mod and preload it to bypass sv_pure, people have found async disk loading to be incompatible with preloading, so you’ll have to use the Slow I/O addon.

yttrium’s viewmodels not preloading

If you use yttrium’s viewmodels, the installer adds a preload command to your autoexec.cfg. However, since mastercomfig doesn’t use your autoexec.cfg, you’ll have to add this to your user/autoexec.cfg:

map_background preload_room; wait 10; disconnect

Crashing when trying to preload mods

Preloading conflicts with a memory usage optimization in the mastercomfig low memory addon. Set cl_always_flush_models 0.

TF2 crashing on a custom map

If TF2 is crashing to desktop after a custom map loading / after picking a class on a custom map enter mat_phong 1 in console. The crashes are caused by lightmapped props and phong must be enabled to allow the map to load properly. All Valve maps except for rd_asteroid don’t use lightmapped props. More information at TF2Maps.

Item panels are taking too long to load

Set tf_time_loading_item_panels 0.0005.